生态与农村环境学报2012，Vol.28Issue(2)：181-186,6.
人居生活废弃物生物黑炭对水溶液中Cd2+的吸附研究
Adsorption of Cadmium in Solution by Biochar From Household Biowaste
摘要
Abstract
Biochar produced via pyrolysis of household biowaste was used as an adsorbent in an experiment to study kinetics and thermodynamics of its adsorption of Cd + in solution and to explore effects of incubation time, initial Cd + concentration , adsorbent dosage, solution pH as well as particle size of biochar on its Cd + adsorption rate with the equilibrium adsorption method. Results show that the adsorption basically reached equilibrium after 2 h and the process could be well described with the pseudo second order dynamic equation. The adsorption curves followed an isothermic adsorption model, which could be well described with the Langmuir model. The Cd + adsorption peaked at 25℃ , reaching 6. 22 mg ? G-1 as simulated with the Langmuir model. Cd + removal rate increased with increasing dosage of biochar and decreasing particle size of biochar. The effect of pH on Cd2 + adsorption capacity was not obvious when initial pH of the solution was 4. 0 -7. 5. When biochar is used to remove Cd + from wastewater, it is advisable to control the initial Cd+ concentration at 30 mg ? L-1 , particle size of the biochar at < 0. 25 mm, dosage of the biochar at 8 g ? L-1 , reaction temperature at 25℃ , and duration of the reaction at 1 - 2 h. In this case, the Cd + removal rate can be as high as 80%. This indicates that biochar made from household biowaste can be as adsorbent to remove Cd2+ in polluted water.关键词
Cd2+/生物质废弃物/生物黑炭/吸附动力学/吸附等温线Key words
cadmium/ household biowaste/ biochar/ sorption kinetics/ isotherm分类
资源环境引用本文复制引用
秦海芝,刘莹莹,李恋卿,潘根兴,张旭辉,郑金伟..人居生活废弃物生物黑炭对水溶液中Cd2+的吸附研究[J].生态与农村环境学报,2012,28(2):181-186,6.基金项目
中央高校基本科研经费(KYZ200908) （KYZ200908）
